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Parameterize basic_format_arg on context (#442)

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This commit is contained in:
Victor Zverovich 2016-12-29 09:07:39 -08:00
parent 422236af7c
commit d705d51671
5 changed files with 105 additions and 100 deletions
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6
fmt/format.cc
View File

@ -458,7 +458,7 @@ template struct internal::BasicData<void>;
template void internal::FixedBuffer<char>::grow(std::size_t);
template void internal::ArgMap<char>::init(const format_args &args);
template void internal::ArgMap<format_context>::init(const format_args &args);
template void printf_context<char>::format(Writer &writer);
@ -472,9 +472,11 @@ template int internal::CharTraits<char>::format_float(
// Explicit instantiations for wchar_t.
template class basic_format_context<wchar_t>;
template void internal::FixedBuffer<wchar_t>::grow(std::size_t);
template void internal::ArgMap<wchar_t>::init(const wformat_args &args);
template void internal::ArgMap<wformat_context>::init(const wformat_args &args);
template void printf_context<wchar_t>::format(WWriter &writer);

137
fmt/format.h
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@ -230,10 +230,9 @@ typedef __int64 intmax_t;
# define FMT_BUILTIN_CLZLL(n) __builtin_clzll(n)
#endif
// Some compilers masquerade as both MSVC and GCC-likes or
// otherwise support __builtin_clz and __builtin_clzll, so
// only define FMT_BUILTIN_CLZ using the MSVC intrinsics
// if the clz and clzll builtins are not available.
// Some compilers masquerade as both MSVC and GCC-likes or otherwise support
// __builtin_clz and __builtin_clzll, so only define FMT_BUILTIN_CLZ using the
// MSVC intrinsics if the clz and clzll builtins are not available.
#if FMT_MSC_VER && !defined(FMT_BUILTIN_CLZLL)
# include <intrin.h> // _BitScanReverse, _BitScanReverse64
@ -371,7 +370,7 @@ class BasicWriter;
typedef BasicWriter<char> Writer;
typedef BasicWriter<wchar_t> WWriter;
template <typename Char>
template <typename Context>
class basic_format_arg;
template <typename Char>
@ -1331,11 +1330,11 @@ class MakeValue : public Value<typename Context::char_type> {
}
};
template <typename Char>
template <typename Context>
class ArgMap;
template <typename Context, typename T>
basic_format_arg<typename Context::char_type> make_arg(const T &value);
basic_format_arg<Context> make_arg(const T &value);
} // namespace internal
struct monostate {};
@ -1345,25 +1344,25 @@ class basic_format_args;
// A formatting argument. It is a trivially copyable/constructible type to
// allow storage in internal::MemoryBuffer.
template <typename Char>
template <typename Context>
class basic_format_arg {
private:
typedef typename Context::char_type Char;
internal::Value<Char> value_;
internal::Type type_;
template <typename Context, typename T>
friend basic_format_arg<typename Context::char_type>
internal::make_arg(const T &value);
template <typename ContextType, typename T>
friend basic_format_arg<ContextType> internal::make_arg(const T &value);
template <typename Visitor, typename CharType>
template <typename Visitor, typename ContextType>
friend typename std::result_of<Visitor(int)>::type
visit(Visitor &&vis, basic_format_arg<CharType> arg);
visit(Visitor &&vis, basic_format_arg<ContextType> arg);
template <typename Context, typename CharType>
template <typename ContextType, typename CharType>
friend class basic_format_args;
template <typename CharType>
friend class internal::ArgMap;
friend class internal::ArgMap<Context>;
public:
basic_format_arg() : type_(internal::NONE) {}
@ -1385,8 +1384,8 @@ class basic_format_arg {
}
};
typedef basic_format_arg<char> format_arg;
typedef basic_format_arg<wchar_t> wformat_arg;
typedef basic_format_arg<format_context> format_arg;
typedef basic_format_arg<wformat_context> wformat_arg;
/**
\rst
@ -1395,9 +1394,10 @@ typedef basic_format_arg<wchar_t> wformat_arg;
``vis(value)`` will be called with the value of type ``double``.
\endrst
*/
template <typename Visitor, typename Char>
template <typename Visitor, typename Context>
typename std::result_of<Visitor(int)>::type
visit(Visitor &&vis, basic_format_arg<Char> arg) {
visit(Visitor &&vis, basic_format_arg<Context> arg) {
typedef typename Context::char_type Char;
switch (arg.type_) {
case internal::NONE:
return vis(monostate());
@ -1438,8 +1438,8 @@ typename std::result_of<Visitor(int)>::type
namespace internal {
template <typename Context, typename T>
basic_format_arg<typename Context::char_type> make_arg(const T &value) {
basic_format_arg<typename Context::char_type> arg;
basic_format_arg<Context> make_arg(const T &value) {
basic_format_arg<Context> arg;
arg.type_ = internal::type<T>();
arg.value_ = internal::MakeValue<Context>(value);
return arg;
@ -1489,14 +1489,15 @@ void format_value(BasicWriter<Char> &, const T &, Formatter &, const Char *) {
"an overload of format_arg.");
}
template <typename Char>
struct NamedArg : basic_format_arg<Char> {
template <typename Context>
struct NamedArg : basic_format_arg<Context> {
typedef typename Context::char_type Char;
BasicStringRef<Char> name;
template <typename T>
NamedArg(BasicStringRef<Char> argname, const T &value)
: basic_format_arg<Char>(make_arg< basic_format_context<Char> >(value)),
name(argname) {}
: basic_format_arg<Context>(make_arg<Context>(value)), name(argname) {}
};
class RuntimeError : public std::runtime_error {
@ -1524,8 +1525,7 @@ inline typename std::enable_if<
}
template <bool IS_PACKED, typename Context, typename T>
inline typename std::enable_if<
!IS_PACKED, basic_format_arg<typename Context::char_type>>::type
inline typename std::enable_if<!IS_PACKED, basic_format_arg<Context>>::type
make_arg(const T& value) {
return make_arg<Context>(value);
}
@ -1542,7 +1542,7 @@ class format_arg_store {
typedef typename Context::char_type char_type;
typedef typename std::conditional<IS_PACKED,
internal::Value<char_type>, basic_format_arg<char_type>>::type value_type;
internal::Value<char_type>, basic_format_arg<Context>>::type value_type;
// If the arguments are not packed, add one more element to mark the end.
typedef std::array<value_type, NUM_ARGS + (IS_PACKED ? 0 : 1)> Array;
@ -1574,7 +1574,7 @@ template <typename Context, typename Char>
class basic_format_args {
public:
typedef unsigned size_type;
typedef basic_format_arg<Char> format_arg;
typedef basic_format_arg<Context> format_arg;
private:
// To reduce compiled code size per formatting function call, types of first
@ -1597,7 +1597,7 @@ class basic_format_args {
(types_ & (mask << shift)) >> shift);
}
friend class internal::ArgMap<Char>;
friend class internal::ArgMap<Context>;
void set_data(const internal::Value<Char> *values) { values_ = values; }
void set_data(const format_arg *args) { args_ = args; }
@ -1869,20 +1869,20 @@ inline StrFormatSpec<wchar_t> pad(
namespace internal {
template <typename Char>
template <typename Context>
class ArgMap {
private:
typedef typename Context::char_type Char;
typedef std::vector<
std::pair<fmt::BasicStringRef<Char>, basic_format_arg<Char> > > MapType;
std::pair<fmt::BasicStringRef<Char>, basic_format_arg<Context> > > MapType;
typedef typename MapType::value_type Pair;
MapType map_;
public:
template <typename Context>
void init(const basic_format_args<Context, Char> &args);
const basic_format_arg<Char>
const basic_format_arg<Context>
*find(const fmt::BasicStringRef<Char> &name) const {
// The list is unsorted, so just return the first matching name.
for (typename MapType::const_iterator it = map_.begin(), end = map_.end();
@ -1894,12 +1894,11 @@ class ArgMap {
}
};
template <typename Char>
template <typename Context>
void ArgMap<Char>::init(const basic_format_args<Context, Char> &args) {
void ArgMap<Context>::init(const basic_format_args<Context, Char> &args) {
if (!map_.empty())
return;
typedef internal::NamedArg<Char> NamedArg;
typedef internal::NamedArg<Context> NamedArg;
const NamedArg *named_arg = 0;
bool use_values =
args.type(MAX_PACKED_ARGS - 1) == internal::NONE;
@ -2072,7 +2071,7 @@ class format_context_base {
int next_arg_index_;
protected:
typedef basic_format_arg<Char> format_arg;
typedef basic_format_arg<Context> format_arg;
format_context_base(const Char *format_str,
basic_format_args<Context, Char> args)
@ -2149,24 +2148,25 @@ class ArgFormatter : public internal::ArgFormatterBase<Char> {
template <typename Char>
class basic_format_context :
public internal::format_context_base<Char, basic_format_context<Char>> {
public:
/** The character type for the output. */
typedef Char char_type;
private:
internal::ArgMap<Char> map_;
internal::ArgMap<basic_format_context<Char>> map_;
FMT_DISALLOW_COPY_AND_ASSIGN(basic_format_context);
typedef internal::format_context_base<Char, basic_format_context<Char>> Base;
using typename Base::format_arg;
typedef typename Base::format_arg format_arg;
using Base::get_arg;
// Checks if manual indexing is used and returns the argument with
// specified name.
basic_format_arg<Char> get_arg(BasicStringRef<Char> name, const char *&error);
format_arg get_arg(BasicStringRef<Char> name, const char *&error);
public:
/** The character type for the output. */
typedef Char char_type;
/**
\rst
Constructs a ``basic_format_context`` object. References to the arguments are
@ -2178,7 +2178,7 @@ class basic_format_context :
: Base(format_str, args) {}
// Parses argument id and returns corresponding argument.
basic_format_arg<Char> parse_arg_id();
format_arg parse_arg_id();
using Base::ptr;
};
@ -3274,21 +3274,23 @@ inline void format_decimal(char *&buffer, T value) {
\endrst
*/
template <typename T>
inline internal::NamedArg<char> arg(StringRef name, const T &arg) {
return internal::NamedArg<char>(name, arg);
inline internal::NamedArg<format_context> arg(StringRef name, const T &arg) {
return internal::NamedArg<format_context>(name, arg);
}
template <typename T>
inline internal::NamedArg<wchar_t> arg(WStringRef name, const T &arg) {
return internal::NamedArg<wchar_t>(name, arg);
inline internal::NamedArg<wformat_context> arg(WStringRef name, const T &arg) {
return internal::NamedArg<wformat_context>(name, arg);
}
// The following two functions are deleted intentionally to disable
// nested named arguments as in ``format("{}", arg("a", arg("b", 42)))``.
template <typename Char>
void arg(StringRef, const internal::NamedArg<Char>&) FMT_DELETED_OR_UNDEFINED;
template <typename Char>
void arg(WStringRef, const internal::NamedArg<Char>&) FMT_DELETED_OR_UNDEFINED;
template <typename Context>
void arg(StringRef, const internal::NamedArg<Context>&)
FMT_DELETED_OR_UNDEFINED;
template <typename Context>
void arg(WStringRef, const internal::NamedArg<Context>&)
FMT_DELETED_OR_UNDEFINED;
}
#if FMT_GCC_VERSION
@ -3351,8 +3353,8 @@ struct IsUnsigned {
}
};
template <typename Char>
void check_sign(const Char *&s, const basic_format_arg<Char> &arg) {
template <typename Char, typename Context>
void check_sign(const Char *&s, const basic_format_arg<Context> &arg) {
char sign = static_cast<char>(*s);
require_numeric_argument(arg, sign);
if (visit(IsUnsigned(), arg)) {
@ -3425,25 +3427,27 @@ struct PrecisionHandler {
} // namespace internal
template <typename Char>
inline basic_format_arg<Char> basic_format_context<Char>::get_arg(
inline typename basic_format_context<Char>::format_arg
basic_format_context<Char>::get_arg(
BasicStringRef<Char> name, const char *&error) {
if (this->check_no_auto_index(error)) {
map_.init(this->args());
const basic_format_arg<Char> *arg = map_.find(name);
if (arg)
if (const format_arg *arg = map_.find(name))
return *arg;
error = "argument not found";
}
return basic_format_arg<Char>();
return format_arg();
}
template <typename Char>
inline basic_format_arg<Char> basic_format_context<Char>::parse_arg_id() {
inline typename basic_format_context<Char>::format_arg
basic_format_context<Char>::parse_arg_id() {
const Char *&s = this->ptr();
if (!internal::is_name_start(*s)) {
const char *error = 0;
basic_format_arg<Char> arg = *s < '0' || *s > '9' ?
this->next_arg(error) : get_arg(internal::parse_nonnegative_int(s), error);
format_arg arg = *s < '0' || *s > '9' ?
this->next_arg(error) :
get_arg(internal::parse_nonnegative_int(s), error);
if (error) {
FMT_THROW(format_error(
*s != '}' && *s != ':' ? "invalid format string" : error));
@ -3456,8 +3460,7 @@ inline basic_format_arg<Char> basic_format_context<Char>::parse_arg_id() {
c = *++s;
} while (internal::is_name_start(c) || ('0' <= c && c <= '9'));
const char *error = 0;
basic_format_arg<Char> arg =
get_arg(BasicStringRef<Char>(start, s - start), error);
format_arg arg = get_arg(BasicStringRef<Char>(start, s - start), error);
if (error)
FMT_THROW(format_error(error));
return arg;
@ -3465,7 +3468,7 @@ inline basic_format_arg<Char> basic_format_context<Char>::parse_arg_id() {
// Formats a single argument.
template <typename ArgFormatter, typename Char, typename Context>
void do_format_arg(BasicWriter<Char> &writer, const basic_format_arg<Char> &arg,
void do_format_arg(BasicWriter<Char> &writer, basic_format_arg<Context> arg,
Context &ctx) {
const Char *&s = ctx.ptr();
FormatSpec spec;
@ -3643,7 +3646,7 @@ struct UdlArg {
const Char *str;
template <typename T>
NamedArg<Char> operator=(T &&value) const {
NamedArg<basic_format_context<Char>> operator=(T &&value) const {
return {str, std::forward<T>(value)};
}
};

49
fmt/printf.h
View File

@ -80,14 +80,16 @@ struct is_same<T, T> {
enum { value = 1 };
};
template <typename T, typename Char>
template <typename T, typename Context>
class ArgConverter {
private:
basic_format_arg<Char> &arg_;
Char type_;
typedef typename Context::char_type Char;
basic_format_arg<Context> &arg_;
typename Context::char_type type_;
public:
ArgConverter(basic_format_arg<Char> &arg, Char type)
ArgConverter(basic_format_arg<Context> &arg, Char type)
: arg_(arg), type_(type) {}
void operator()(bool value) {
@ -105,11 +107,11 @@ class ArgConverter {
if (sizeof(TargetType) <= sizeof(int)) {
// Extra casts are used to silence warnings.
if (is_signed) {
arg_ = internal::make_arg<format_context>(
arg_ = internal::make_arg<Context>(
static_cast<int>(static_cast<TargetType>(value)));
} else {
typedef typename internal::MakeUnsigned<TargetType>::Type Unsigned;
arg_ = internal::make_arg<format_context>(
arg_ = internal::make_arg<Context>(
static_cast<unsigned>(static_cast<Unsigned>(value)));
}
} else {
@ -117,10 +119,9 @@ class ArgConverter {
// glibc's printf doesn't sign extend arguments of smaller types:
// std::printf("%lld", -42); // prints "4294967254"
// but we don't have to do the same because it's a UB.
arg_ = internal::make_arg<format_context>(
static_cast<LongLong>(value));
arg_ = internal::make_arg<Context>(static_cast<LongLong>(value));
} else {
arg_ = internal::make_arg<format_context>(
arg_ = internal::make_arg<Context>(
static_cast<typename internal::MakeUnsigned<U>::Type>(value));
}
}
@ -137,32 +138,30 @@ class ArgConverter {
// If T is void, the argument is converted to corresponding signed or unsigned
// type depending on the type specifier: 'd' and 'i' - signed, other -
// unsigned).
template <typename T, typename Char>
void convert_arg(basic_format_arg<Char> &arg, Char type) {
visit(ArgConverter<T, Char>(arg, type), arg);
template <typename T, typename Context, typename Char>
void convert_arg(basic_format_arg<Context> &arg, Char type) {
visit(ArgConverter<T, Context>(arg, type), arg);
}
// Converts an integer argument to char for printf.
template <typename Char>
template <typename Context>
class CharConverter {
private:
basic_format_arg<Char> &arg_;
basic_format_arg<Context> &arg_;
FMT_DISALLOW_COPY_AND_ASSIGN(CharConverter);
public:
explicit CharConverter(basic_format_arg<Char> &arg) : arg_(arg) {}
explicit CharConverter(basic_format_arg<Context> &arg) : arg_(arg) {}
template <typename T>
typename std::enable_if<std::is_integral<T>::value>::type
operator()(T value) {
arg_ =
internal::make_arg<basic_format_context<Char>>(static_cast<char>(value));
arg_ = internal::make_arg<Context>(static_cast<char>(value));
}
template <typename T>
typename std::enable_if<!std::is_integral<T>::value>::type
operator()(T value) {
typename std::enable_if<!std::is_integral<T>::value>::type operator()(T) {
// No coversion needed for non-integral types.
}
};
@ -301,12 +300,13 @@ class printf_context :
private:
typedef internal::format_context_base<Char, printf_context> Base;
typedef typename Base::format_arg format_arg;
void parse_flags(FormatSpec &spec, const Char *&s);
// Returns the argument with specified index or, if arg_index is equal
// to the maximum unsigned value, the next argument.
basic_format_arg<Char> get_arg(
format_arg get_arg(
const Char *s,
unsigned arg_index = (std::numeric_limits<unsigned>::max)());
@ -356,12 +356,11 @@ void printf_context<Char, AF>::parse_flags(FormatSpec &spec, const Char *&s) {
}
template <typename Char, typename AF>
basic_format_arg<Char> printf_context<Char, AF>::get_arg(
typename printf_context<Char, AF>::format_arg printf_context<Char, AF>::get_arg(
const Char *s, unsigned arg_index) {
(void)s;
const char *error = 0;
basic_format_arg<Char> arg =
arg_index == std::numeric_limits<unsigned>::max() ?
format_arg arg = arg_index == std::numeric_limits<unsigned>::max() ?
this->next_arg(error) : Base::get_arg(arg_index - 1, error);
if (error)
FMT_THROW(format_error(!*s ? "invalid format string" : error));
@ -433,7 +432,7 @@ void printf_context<Char, AF>::format(BasicWriter<Char> &writer) {
}
}
basic_format_arg<Char> arg = get_arg(s, arg_index);
format_arg arg = get_arg(s, arg_index);
if (spec.flag(HASH_FLAG) && visit(internal::IsZeroInt(), arg))
spec.flags_ &= ~internal::to_unsigned<int>(HASH_FLAG);
if (spec.fill_ == '0') {
@ -488,7 +487,7 @@ void printf_context<Char, AF>::format(BasicWriter<Char> &writer) {
break;
case 'c':
// TODO: handle wchar_t
visit(internal::CharConverter<Char>(arg), arg);
visit(internal::CharConverter<printf_context<Char, AF>>(arg), arg);
break;
}
}

3
test/format-impl-test.cc
View File

@ -58,7 +58,8 @@ TEST(FormatTest, ArgConverter) {
using fmt::format_arg;
fmt::LongLong value = std::numeric_limits<fmt::LongLong>::max();
format_arg arg = fmt::internal::make_arg<fmt::format_context>(value);
visit(fmt::internal::ArgConverter<fmt::LongLong, char>(arg, 'd'), arg);
visit(fmt::internal::ArgConverter<
fmt::LongLong, fmt::format_context>(arg, 'd'), arg);
EXPECT_EQ(value, visit(ValueExtractor<fmt::LongLong>(), arg));
}

10
test/util-test.cc
View File

@ -73,9 +73,9 @@ void format_value(fmt::BasicWriter<Char> &w, Test,
w << "test";
}
template <typename Char, typename T>
basic_format_arg<Char> make_arg(const T &value) {
return fmt::internal::make_arg< fmt::basic_format_context<Char> >(value);
template <typename Context, typename T>
basic_format_arg<Context> make_arg(const T &value) {
return fmt::internal::make_arg<Context>(value);
}
} // namespace
@ -487,7 +487,7 @@ VISIT_TYPE(float, double);
#define CHECK_ARG_(Char, expected, value) { \
testing::StrictMock<MockVisitor<decltype(expected)>> visitor; \
EXPECT_CALL(visitor, visit(expected)); \
fmt::visit(visitor, make_arg<Char>(value)); \
fmt::visit(visitor, make_arg<fmt::basic_format_context<Char>>(value)); \
}
#define CHECK_ARG(value) { \
@ -575,7 +575,7 @@ TEST(UtilTest, CustomArg) {
EXPECT_EQ("test", w.str());
return Visitor::Result();
}));
fmt::visit(visitor, make_arg<char>(test));
fmt::visit(visitor, make_arg<fmt::format_context>(test));
}
TEST(ArgVisitorTest, VisitInvalidArg) {